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Some improvements to error handling

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This commit is contained in:
mo8it 2024-03-31 18:25:54 +02:00
parent 82b563f165
commit c1de4d46aa
3 changed files with 55 additions and 66 deletions
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23
src/exercise.rs
View file

@ -114,14 +114,9 @@ impl Exercise {
}
}
pub fn state(&self) -> State {
let source_file = File::open(&self.path).unwrap_or_else(|e| {
println!(
"Failed to open the exercise file {}: {e}",
self.path.display(),
);
exit(1);
});
pub fn state(&self) -> Result<State> {
let source_file = File::open(&self.path)
.with_context(|| format!("Failed to open the exercise file {}", self.path.display()))?;
let mut source_reader = BufReader::new(source_file);
// Read the next line into `buf` without the newline at the end.
@ -152,7 +147,7 @@ impl Exercise {
// Reached the end of the file and didn't find the comment.
if n == 0 {
return State::Done;
return Ok(State::Done);
}
if contains_not_done_comment(&line) {
@ -198,7 +193,7 @@ impl Exercise {
});
}
return State::Pending(context);
return Ok(State::Pending(context));
}
current_line_number += 1;
@ -218,8 +213,8 @@ impl Exercise {
// without actually having solved anything.
// The only other way to truly check this would to compile and run
// the exercise; which would be both costly and counterintuitive
pub fn looks_done(&self) -> bool {
self.state() == State::Done
pub fn looks_done(&self) -> Result<bool> {
self.state().map(|state| state == State::Done)
}
}
@ -271,7 +266,7 @@ mod test {
},
];
assert_eq!(state, State::Pending(expected));
assert_eq!(state.unwrap(), State::Pending(expected));
}
#[test]
@ -283,7 +278,7 @@ mod test {
hint: String::new(),
};
assert_eq!(exercise.state(), State::Done);
assert_eq!(exercise.state().unwrap(), State::Done);
}
#[test]

84
src/main.rs
View file

@ -92,14 +92,11 @@ fn main() -> Result<()> {
println!("\n{WELCOME}\n");
}
if which::which("cargo").is_err() {
println!(
"Failed to find `cargo`.
which::which("cargo").context(
"Failed to find `cargo`.
Did you already install Rust?
Try running `cargo --version` to diagnose the problem."
);
std::process::exit(1);
}
Try running `cargo --version` to diagnose the problem.",
)?;
let exercises = ExerciseList::parse()?.exercises;
@ -122,7 +119,7 @@ If you are just starting with Rustlings, run the command `rustlings init` to ini
let verbose = args.nocapture;
let command = args.command.unwrap_or_else(|| {
println!("{DEFAULT_OUT}\n");
std::process::exit(0);
exit(0);
});
match command {
@ -160,7 +157,7 @@ If you are just starting with Rustlings, run the command `rustlings init` to ini
let filter_cond = filters
.iter()
.any(|f| exercise.name.contains(f) || fname.contains(f));
let looks_done = exercise.looks_done();
let looks_done = exercise.looks_done()?;
let status = if looks_done {
exercises_done += 1;
"Done"
@ -185,8 +182,8 @@ If you are just starting with Rustlings, run the command `rustlings init` to ini
let mut handle = stdout.lock();
handle.write_all(line.as_bytes()).unwrap_or_else(|e| {
match e.kind() {
std::io::ErrorKind::BrokenPipe => std::process::exit(0),
_ => std::process::exit(1),
std::io::ErrorKind::BrokenPipe => exit(0),
_ => exit(1),
};
});
}
@ -200,35 +197,34 @@ If you are just starting with Rustlings, run the command `rustlings init` to ini
exercises.len(),
percentage_progress
);
std::process::exit(0);
exit(0);
}
Subcommands::Run { name } => {
let exercise = find_exercise(&name, &exercises);
run(exercise, verbose).unwrap_or_else(|_| std::process::exit(1));
let exercise = find_exercise(&name, &exercises)?;
run(exercise, verbose).unwrap_or_else(|_| exit(1));
}
Subcommands::Reset { name } => {
let exercise = find_exercise(&name, &exercises);
let exercise = find_exercise(&name, &exercises)?;
reset(exercise)?;
println!("The file {} has been reset!", exercise.path.display());
}
Subcommands::Hint { name } => {
let exercise = find_exercise(&name, &exercises);
let exercise = find_exercise(&name, &exercises)?;
println!("{}", exercise.hint);
}
Subcommands::Verify => {
verify(&exercises, (0, exercises.len()), verbose, false)
.unwrap_or_else(|_| std::process::exit(1));
verify(&exercises, (0, exercises.len()), verbose, false).unwrap_or_else(|_| exit(1));
}
Subcommands::Watch { success_hints } => match watch(&exercises, verbose, success_hints) {
Err(e) => {
println!("Error: Could not watch your progress. Error message was {e:?}.");
println!("Most likely you've run out of disk space or your 'inotify limit' has been reached.");
std::process::exit(1);
exit(1);
}
Ok(WatchStatus::Finished) => {
println!(
@ -295,25 +291,23 @@ fn spawn_watch_shell(
});
}
fn find_exercise<'a>(name: &str, exercises: &'a [Exercise]) -> &'a Exercise {
fn find_exercise<'a>(name: &str, exercises: &'a [Exercise]) -> Result<&'a Exercise> {
if name == "next" {
exercises
.iter()
.find(|e| !e.looks_done())
.unwrap_or_else(|| {
println!("🎉 Congratulations! You have done all the exercises!");
println!("🔚 There are no more exercises to do next!");
std::process::exit(1)
})
} else {
exercises
.iter()
.find(|e| e.name == name)
.unwrap_or_else(|| {
println!("No exercise found for '{name}'!");
std::process::exit(1)
})
for exercise in exercises {
if !exercise.looks_done()? {
return Ok(exercise);
}
}
println!("🎉 Congratulations! You have done all the exercises!");
println!("🔚 There are no more exercises to do next!");
exit(0);
}
exercises
.iter()
.find(|e| e.name == name)
.with_context(|| format!("No exercise found for '{name}'!"))
}
enum WatchStatus {
@ -363,17 +357,17 @@ fn watch(
&& event_path.exists()
{
let filepath = event_path.as_path().canonicalize().unwrap();
let pending_exercises =
exercises
.iter()
.find(|e| filepath.ends_with(&e.path))
.into_iter()
.chain(exercises.iter().filter(|e| {
!e.looks_done() && !filepath.ends_with(&e.path)
}));
// TODO: Remove unwrap
let pending_exercises = exercises
.iter()
.find(|e| filepath.ends_with(&e.path))
.into_iter()
.chain(exercises.iter().filter(|e| {
!e.looks_done().unwrap() && !filepath.ends_with(&e.path)
}));
let num_done = exercises
.iter()
.filter(|e| e.looks_done() && !filepath.ends_with(&e.path))
.filter(|e| e.looks_done().unwrap() && !filepath.ends_with(&e.path))
.count();
clear_screen();
match verify(

14
src/verify.rs
View file

@ -79,7 +79,7 @@ fn compile_only(exercise: &Exercise, success_hints: bool) -> Result<bool> {
let _ = exercise.run()?;
progress_bar.finish_and_clear();
Ok(prompt_for_completion(exercise, None, success_hints))
prompt_for_completion(exercise, None, success_hints)
}
// Compile the given Exercise and run the resulting binary in an interactive mode
@ -102,7 +102,7 @@ fn compile_and_run_interactively(exercise: &Exercise, success_hints: bool) -> Re
bail!("TODO");
}
Ok(prompt_for_completion(exercise, Some(output), success_hints))
prompt_for_completion(exercise, Some(output), success_hints)
}
// Compile the given Exercise as a test harness and display
@ -139,7 +139,7 @@ fn compile_and_test(
}
if run_mode == RunMode::Interactive {
Ok(prompt_for_completion(exercise, None, success_hints))
prompt_for_completion(exercise, None, success_hints)
} else {
Ok(true)
}
@ -149,9 +149,9 @@ fn prompt_for_completion(
exercise: &Exercise,
prompt_output: Option<Output>,
success_hints: bool,
) -> bool {
let context = match exercise.state() {
State::Done => return true,
) -> Result<bool> {
let context = match exercise.state()? {
State::Done => return Ok(true),
State::Pending(context) => context,
};
match exercise.mode {
@ -215,7 +215,7 @@ fn prompt_for_completion(
);
}
false
Ok(false)
}
fn separator() -> console::StyledObject<&'static str> {